TY - GEN AU - Yolken, H Thomas AU - Mordfin, Leonard C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1989-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.IR.89-4147 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1989 TI - Technical activities 1989 -- Nondestructive Evaluation: ER -